<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <!-- 关键：touch-icon -->
    <link rel="apple-touch-icon" sizes="120x120"
          href="https://www.example.com/apple-touch-icon.png">
    <title>touch icon test</title>
</head>
<body>
<h1>touch icon test page</h1>
</body>
</html>